My father was a track and field coach. He tried unsuccessfully to teach me how to compete in the "discus" throw.
An athlete holds the disc with a palm on - fingers
spread grip. To throw he / she swiftly rotates their entire body with disc arm extended. After two or three revolutions, the disc is released. The farthest throw wins.
Your image is of an older style "wood" discus with metal centre balance and edges. Today's
most common discus is made with composite or ABS materials but still finished with a galvanized steel edge.
The premium, highest spin rate discus, has a carbon composite body and alloy rim.
Discus is an ancient sport. The most famous and classical representation, is the 5th century BC Myron statue, Discobolus.
Discus was one of the events of the ancient pentathlon and dates back to at least 700 BC.
AA